Believe that Jesus is the one and only Son of God. You must also believe that He was born of a virgin, lived a sinless life, was brutally murdered on a cross for our sins and was brought back to life 3 days later. In order for the debt of sin to be paid, a sinless person had to die for the sinful. That sinless person is Jesus. He gave His life as a free gift to us for the sins that we have committed.